350 FOSSIL REPTILES. 



Baron. There is but a small number of teeth preserved, 

 which are narrow and straight. 



Another head, truncated from the front as far as the parietal, 

 and which preserves no teeth ; but the temporal region is very 

 entire, and it also has the hyoid bone. 



Two other heads, flattened vertically, but nearly entire. The 

 teeth are the same as in the first and second skeleton. These 

 heads furnished very satisfactory details concerning the sutures 

 and foramina, and confirmed everything respecting the liyoid 

 bone. 



An enormous lower jaw, which, though very much truncated 

 at both ends, was yet nearly two feet in length. This was a 

 sufficient indication of the size to which the genus might arrive. 

 Finally, there were also some isolated bones, especially of the 

 occiput, which proved of no small utility in illustration of this 

 important part. 



Nothing was wanting for the shoulder and the entire anterior 

 extremity. There was a fragment of a very large individual, 

 where, with many vertebrae and ribs, were found the sternum, 

 the clavicles, the coraco'ids, an omoplate, two humeri, and two 

 fore-arms. From an individual of smaller size, came the ster- 

 num in its proper place, the clavicles, the coraco'ids, an omo- 

 plate, a humerus, a fore-arm, and a bone of the carpus. 



The same bones in another specimen, with the fin almost 

 entire. 



A more complete piece for all these parts from rather a small 

 individual. The left fin was entire, and attached to its shoul- 

 der, which was also complete, as was the sternum and the 

 coracoi'd of the opposite shoulder. 



The Baron declares that he was not so fortunate in regard to 

 the posterior extremity. The pelvis was mutilated in his two 

 skeletons, and he did not meet with one separately. His opi- 

 nion was that these parts were more weak, less adherent, and 

 more easily detached after death. 



We must now enter on a description of the ichthyosaurus, 

 beginning with the teeth. 







